#include "dissectoreth.h"
#include "dissectorarp.h"
#include "dissectorip.h"
#include "dissectoripv6.h"

quint32 DissectorEth::flags = 1;
/*  bit0:    validate the ethernet checksum if possible
 *
 *
*/


DissectorEth::DissectorEth() {}

ProTree* DissectorEth::Dissect(DissResList_t *dissResList,qint64 index, Info *info){
    qDebug() << "准备进入DissectorEth";
    ProTree *proTree =  DissectorFrame::Dissect(dissResList,index,info);
    qDebug() << "DissectorFrame成功";
    eth_hdr *header = GetHdr(dissResList->at(index),info==NULL?true:false);
    DissResEth *dissResEth = ((DissResEth*)dissResList->at(index));
    if(info == NULL){
        dissResList->at(index)->AddHeadersLen(sizeof(eth_hdr));
        dissResEth->SetMacDst(header->dst_mac);
        dissResEth->SetMacSrc(header->src_mac);
        dissResEth->SetEthCRCRes(this->GetCalculatedIntFCS(dissResEth) == this->GetIntFCS(dissResEth));
        qDebug() << "DissectorEth成功";
    }else{
        qint32 start = dissResEth->GetProStart("ethertype");
        proTree->AddItem("ethertype",DissectorEth::MsgTop(dissResList->at(index)),dissResEth->GetProStart("ethertype"),dissResEth->GetProEnd("ethertype"));
        proTree->AddItem("ethertype",DissectorEth::MsgDst(dissResList->at(index)),&start,6,false,ProTree::level::NEW);
        proTree->AddItem("ethertype",DissectorEth::MsgLG(header->dst_mac),&start,6,false,ProTree::NEW);
        proTree->AddItem("ethertype",DissectorEth::MsgIG(header->dst_mac),&start,6);
        proTree->Pop();
        proTree->AddItem("ethertype",DissectorEth::MsgSrc(dissResList->at(index)),&start,6,false);
        proTree->AddItem("ethertype",DissectorEth::MsgLG(header->src_mac),&start,6,false,ProTree::NEW);
        proTree->AddItem("ethertype",DissectorEth::MsgIG(header->src_mac),&start,6);
        proTree->Pop();
        proTree->AddItem("ethertype",DissectorEth::MsgType(header),&start,2);
        DissectorEth::DealFCS(proTree,dissResList->at(index));
        proTree->Pop();
    }
    switch (GetPtoType(header)) {
    case (ushort)0x0800:
        DissectorIp::Dissect(dissResList->at(index),proTree,info);
        break;
    case (ushort)0x0806:
        DissectorArp::Dissect(dissResList->at(index),proTree,info);
        break;
    case (ushort)0x86dd:
        DissectorIpv6::Dissect(dissResList->at(index),proTree,info);
        break;
    default:
        ((DissResEth*)dissResList->at(index))->SetMsg("ETH: 未知上层协议");
        break;
    }
    return proTree;
}

//Get方法
eth_hdr* DissectorEth::GetHdr(DissRes *dissRes,bool first){
    if(first)
        dissRes->AddToProtocolStackWithSE("ethertype",sizeof (eth_hdr));
    eth_hdr *header = (eth_hdr*)(dissRes->GetData() + dissRes->GetProStart("ethertype"));
    return header;
}

ushort DissectorEth::GetPtoType(eth_hdr *header){
    return ntohs(header->eth_type);
}

quint32 DissectorEth::GetIntFCS(DissRes *packet){
    return ntohl(*(packet->GetData() + packet->GetCapLen() - 4));
}

QString DissectorEth::GetStrFCS(DissRes *packet){
    const uchar *fcs = packet->GetData() + packet->GetCapLen() -4;
    return QString::asprintf("0x%02x%02x%02x%02x",fcs[0],fcs[1],fcs[2],fcs[3]);
}

quint32 DissectorEth::GetCalculatedIntFCS(DissRes *packet){
    quint32 crc32_tab[] =
    {
    0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
    0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
    0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
    0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
    0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
    0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
    0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
    0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
    0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
    0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
    0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
    0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
    0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
    0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
    0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
    0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
    0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
    0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
    0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
    0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
    0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
    0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
    0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
    0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
    0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
    0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
    0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
    0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
    0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
    0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
    0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
    0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
    0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
    0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
    0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
    0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
    0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
    0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
    0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
    0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
    0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
    0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
    0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
    0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
    0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
    0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
    0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
    0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
    0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
    0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
    0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
    0x2d02ef8dL
    };
    quint32 crc32val = 0;
    crc32val ^= 0xFFFFFFFF;
    for (qint32 i = 0; i < packet->GetCapLen(); i++)
        crc32val = crc32_tab[(crc32val ^ packet->GetData()[i]) & 0xFF] ^ ((crc32val >> 8) & 0x00FFFFFF);
    return ntohl(crc32val ^ 0xFFFFFFFF);
}


QString DissectorEth::GetCalculatedStrFCS(DissRes *packet){
    quint32 crc = this->GetCalculatedIntFCS(packet);
    uchar *p = (uchar*)&crc;
    return QString::asprintf("0x%02x%02x%02x%02x",p[0],p[1],p[2],p[3]);
}

//Msg方法
QString DissectorEth::MsgTop(DissRes *dissRes){
    DissResEth *dissResEth = ((DissResEth*)dissRes);
    return QString("Ethernet II : Src : ")
            + dissResEth->GetStrMacSrc() + " , "
            + "Dst : "
            + dissResEth->GetStrMacDst();
}

QString DissectorEth::MsgDst(DissRes *dissRes){
    DissResEth *dissResEth = ((DissResEth*)dissRes);
    return QString("Destination: ") + dissResEth->GetStrMacDst();
}

QString DissectorEth::MsgSrc(DissRes *dissRes){
    DissResEth *dissResEth = ((DissResEth*)dissRes);
    return QString("Source: ") + dissResEth->GetStrMacSrc();
}

QString DissectorEth::MsgType(eth_hdr *eth){
    QString strtype = "unknow";
    quint16 inttype = ntohs(eth->eth_type);
    switch (inttype) {
    case 0x0800:
        strtype = "IPv4";
        break;
    case 0x0806:
        strtype = "Arp";
        break;
    case 0x86dd:
        strtype = "Ipv6";
        break;
    }
    return QString("Type: ") + strtype + QString::asprintf("(0x%02x%02x)",((uchar*)&inttype)[1],((uchar*)&inttype)[0]);
}

QString DissectorEth::MsgLG(uchar *mac){
    uchar LGbit = (mac[0] & 0x02) >> 1;
    return QString::asprintf(".... ..%d. .... .... .... .... = LG bit: ",LGbit)
                + ((LGbit == 1)?"Locally administered address (this is not factory default)"
                              :"Globally unique address (factory default)");
}

QString DissectorEth::MsgIG(uchar *mac){
    uchar IGbit = (mac[0] & 0x01) >> 0;
    return QString::asprintf(".... ...%d .... .... .... .... = IG bit: ",IGbit)
                + ((IGbit == 1)?"Group address (multicast/broadcast)"
                              :"Individual address (unicast)");
}

//Deal方法
void DissectorEth::DealFCS(ProTree *tree, DissRes *dissRes){
    DissResEth *dissResEth = ((DissResEth*)dissRes);
    QString str;
    if(DissectorEth::FlagGetValidateFCSBit() == 1 && !dissResEth->GetEthCRCRes()){
            str = QString("Frame check sequence : ") + DissectorEth::GetStrFCS(dissRes) + " incorrect , should be "
                    + DissectorEth::GetCalculatedStrFCS(dissRes);
            tree->AddItem("ethertype",str,dissRes->GetCapLen() - 4,dissRes->GetCapLen() -1);
            str = QString("FCS status : Bad");
            tree->AddItem("ethertype",str,dissRes->GetCapLen() - 4,dissRes->GetCapLen() -1,ProTree::NEW);
            tree->Pop();
    }
}


//Flag方法
void DissectorEth::FlagSetValidateFCSBit(uchar option){
    if(option == 0){
        DissectorEth::flags &= 0xfffffffe;
    }else{
        DissectorEth::flags |= 0x00000001;
    }
}

uchar DissectorEth::FlagGetValidateFCSBit(){
    return (DissectorEth::flags & 0x00000001) >> 0;
}
